Preliminary study of the pre-germinative treatments of Juniperus oxycedrus L. and Pistacia lentiscus L. in the Saida region (Western Algeria)

Abstract

Juniperus oxycedrus L. and Pistacia lentiscus L. are two taxa with a rigid or rigid enough structure caused by a solid pericarp resulting in a strong inhibition of the germination. The objective of this work was to test the effectiveness of certain pre-germinative treatments on the germination rate of the Juniperus oxycedrus and Pistacia lentiscus seeds with the aim of restoring perturbed ecosystems. In this context 180 seeds from each of the 2 examined species were tested in the laboratory (the number of repetitions is 5, to reach the degree of freedom 'ddl'). The seeds were divided into 4 groups of 20 seeds of each species and were treated as follows: 1) Immersion in the concentrated (95%) sulphuric acid (H2SO4) for 10, 30 and 60 minutes; 2) Mechanical scarification with a scalpel; 3) Soaking in hot water (at 100°C) for 30 seconds, 60 seconds and 2 minutes; 4) Cold stratification at 5°C for 24 hours. There is also a control group of 20 seeds representing each of the two species, which remained neutral. In the case of the Juniperus oxycedrus seeds the results showed that the germination rate improves after the mechanical scarification with a scalpel (92%), followed by the cold stratification with water (86%) and a treatment with a concentrated sulphuric acid for 60 minutes (82%). The seeds were treated with H2SO4 for 10 and 30 minutes, respectively, soaked in hot water; the control lot did not germinate. The germination rate for the Pistacia lentiscus seeds is 88% after the mechanical scarification and 84% after the cold water stratification. On the other hand, the treatment with H2SO4 or after soaking in hot water does not allow for the germination of these seeds. The same result is observed on the control group (0% for 30 days).

Some Edaphic Aspects of the Matorrals of Sidi-Djilali (South-West of Tlemcen)

“…Edaphology is only one part of pedology, in fact it deals with the genesis and distribution of Killian soils [4]. DOI: 10.2478/arls-2023-0007 ARLS, 7, 2023, 54 -67 55 Algeria is part of the group of Mediterranean countries where the drought, observed for a long time, clearly led to the process of salinization of the Ozanda soils [1]; Gaucher and Burdin [5] with 3.2 million Ha [6,[7][8][9][10][11][12][13]. These two natural constraints, drought and salinity, have modified the stability of ecosystems.…”

“…Valentin [15]; Lieth et al [16] show that this situation is gradually evolving towards the phenomenon of desertification of Hamdy soils [17]. Orania is characterized by a particularly important extension of salty environments, the halophilic zones extend especially in the semi-arid bioclimatic stage with hot winter as well as in the arid enclaves [18][19][20][21]. The soils of the sub-littoral depressions in Oranie are of the Solontchak type with a sodium complex mainly loaded with sodium chloride [22][23][24].…”